diff --git a/site/Gemfile.lock b/site/Gemfile.lock
index 065107ec25f..db9480a4e69 100644
--- a/site/Gemfile.lock
+++ b/site/Gemfile.lock
@@ -5,7 +5,6 @@ GEM
       i18n (~> 0.6, >= 0.6.4)
       multi_json (~> 1.0)
     addressable (2.3.5)
-    atomic (1.1.14)
     chunky_png (1.2.9)
     coffee-script (2.2.0)
       coffee-script-source
@@ -15,6 +14,7 @@ GEM
       chunky_png (~> 1.2)
       fssm (>= 0.2.7)
       sass (~> 3.1)
+    concurrent-ruby (1.1.10)
     em-websocket (0.5.0)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.5.3)
@@ -96,11 +96,9 @@ GEM
       sprockets (~> 2.0)
       tilt (~> 1.1)
     thor (0.18.1)
-    thread_safe (0.1.3)
-      atomic
     tilt (1.3.7)
-    tzinfo (1.1.0)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
     uglifier (2.1.2)
       execjs (>= 0.3.0)
       multi_json (~> 1.0, >= 1.0.2)